http://blog.csdn.net/stormagic/archive/2010/05/16/5598592.aspx
http://fengshujuan.iteye.com/blog/97291
利用jbpm制作流程图
http://jbpm.group.iteye.com/group/topic/14049
http://www.blogjava.net/ycyk168/archive/2008/09/25/231092.html
JBPM实践之:在流程图上高亮显示指定的任务节点